Customer codes

The customerCode value identifies the customer who is transacting with the company. Because a transaction is legally defined as a transaction between a buyer and a seller, the customerCode and companyCode values identify the two parties involved in the transaction.

For example, if the transaction type is a SalesInvoice, the transaction is deemed to be a sale made by the company identified by companyCode sold to the buyer identified by the customerCode.

This determination is necessary for our software to handle exemption certificates correctly. In AvaTax, the customerCode is used to identify customers who have an exemption in either AvaTax or in Exemption Certificate Management. So, AvaTax requires a customerCode field to ensure that exemptions will work correctly when you begin working with certificates.